package cobol

import (
	"errors"
	"strconv"
	"strings"
	"time"
)

//  --------------------------------------------------------------------------------
//  | Your String Component | Example | Go Reference Component | Layout String Part |
//  --------------------------------------------------------------------------------
//  | 4-digit year          | 2025    | 2006                   | 2006               |
//  | Separator             | /       | (literal)              | /                  |
//  | 2-digit month         | 10      | 01                     | 01                 |
//  | Separator             | /       | (literal)              | /                  |
//  | 2-digit day           | 14      | 02                     | 02                 |
//  | Space separator       |         | (literal)              |                    |
//  | 2-digit hour (24h)    | 12      | 15                     | 15                 |
//  | Separator             | :       | (literal)              | :                  |
//  | 2-digit minute        | 13      | 04                     | 04                 |
//  | Separator             | :       | (literal)              | :                  |
//  | 2-digit second        | 12      | 05                     | 05                 |
//  --------------------------------------------------------------------------------

func doTimeString(BUILDTIME string) (*time.Time, error) {
	parts := strings.Split(BUILDTIME, " ")
	if len(parts) == 1 {
		return doTimeSingleString(parts[0])
	}
	if len(parts) >= 2 {
		if len(parts[0]) == 10 && len(parts[1]) == 8 {
			// fmt.Println("GOT HERE also", BUILDTIME)
			const layout = "2006/01/02 15:04:05"
			t, err := time.ParseInLocation(layout, parts[0]+" "+parts[1], time.UTC)
			if err == nil {
				return &t, nil
			}

		}
	}
	// try lots of common stuff
	const layout = "2006-01-02 15:04:05 -0500 CDT"
	t, err := time.ParseInLocation(layout, parts[0]+" "+parts[1], time.UTC)
	if err == nil {
		return &t, nil
	}
	return nil, NewFeature
}

// string is a single string with no spaces
func doTimeSingleString(BUILDTIME string) (*time.Time, error) {
	// The input epoch seconds
	// epochSeconds := int64(1758646486)
	num, err := strconv.Atoi(BUILDTIME)
	if err == nil {
		epochSeconds := int64(num)
		// Convert the epoch seconds to a time.Time object.
		// time.Unix() creates the time in the UTC timezone by default.
		t := time.Unix(epochSeconds, 0)
		return &t, errors.New("treated string as seconds")
	}
	{
		const layout = "2006.01.02"
		t, err := time.ParseInLocation(layout, BUILDTIME, time.UTC)
		if err == nil {
			return &t, nil
		}
	}

	{
		const layout = "2006-01-02"
		t, err := time.ParseInLocation(layout, BUILDTIME, time.UTC)
		if err == nil {
			return &t, nil
		}
	}

	const layout = "2006/01/02"
	t, err := time.ParseInLocation(layout, BUILDTIME, time.UTC)
	if err == nil {
		return &t, nil
	}
	return nil, err
}